CRUD Display List – Fyne Golang GUI Tutorial 59
CRUD Display List – Fyne Golang GUI Tutorial 59
package main // import fyne import ( "encoding/json" "io/ioutil" "fyne.io/fyne/v2" "fyne.io/fyne/v2/app" "fyne.io/fyne/v2/container" "fyne.io/fyne/v2/widget" ) func main() { // student struct, you can use any name type Student struct { Name string // name N is capital Phone string } // Now creat a slice/ array to store data var myStudentData []Student // welcome again //lets read data from file and display it in list data_from_file, _ := ioutil.ReadFile("myFile_name.txt") // file name with extension .txt or .json // unmarshall/parse data received from file and save/push in slice // 2 argument 1. data source, 2. data slice to store data json.Unmarshal(data_from_file, &myStudentData) // now we can use this data in our list // lets create our list // new app a := app.New() // new title and window w := a.NewWindow("CRUD APP") // resize window w.Resize(fyne.NewSize(400, 400)) // entry widget for name e_name := widget.NewEntry() e_name.SetPlaceHolder("Enter name here...") // entry widget for phone e_phone := widget.NewEntry() e_phone.SetPlaceHolder("Enter phone here...") // submit button submit_btn := widget.NewButton("Submit", func() { // logic part- store our data in json format // let create a struct for our data // Get data from entry widget and push to slice myData1 := &Student{ Name: e_name.Text, // data from name entry widget Phone: e_phone.Text, } // append / push data to our slice myStudentData = append(myStudentData, *myData1) // * star is very important // convert / parse data to json format // 3 arguments // 1st is our slice data // ignore 2nd // 3rd is identation, we are using space to indent our data final_data, _ := json.MarshalIndent(myStudentData, "", " ") // writing data to file // it take 3 things //file name .txt or .json or anything you want to use // data source, final_data in our case // writing/reading/execute permission ioutil.WriteFile("myFile_name.txt", final_data, 0644) /// we are done :) // lets test // empty input field after data insertion e_name.Text = "" e_phone.Text = "" // refresh name & phone entry object e_name.Refresh() e_phone.Refresh() }) // list widget list := widget.NewList( // first argument is item count // len() function to get myStudentData slice len func() int { return len(myStudentData) }, // 2nd argument is for widget choice. I want to use label func() fyne.CanvasObject { return widget.NewLabel("") }, // 3rd argument is to update widget with our new data func(lii widget.ListItemID, co fyne.CanvasObject) { co.(*widget.Label).SetText(myStudentData[lii].Name) }, ) // show and run w.SetContent( // lets create Hsplite container container.NewHSplit( // first argument is list of data list, // 2nd is // vbox container container.NewVBox(e_name, e_phone, submit_btn), ), ) w.ShowAndRun() }
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